Die head



Aug. 30, 1932. H. 1'. sHEARER ETAL 1,874,643.

DIE HEAD Filed Deo. 27. 1928 3 Sheets-Sheet 2 Aug. 30, 1932. H. T.sH'EARER E1' AL DIE HEAD Filed D96. 27. 1928 3 Sheets-Sheet 3'IIIIIIIIII WMI .nh

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Fatentec! ugv. 30, 1932 UNITED sTA'rEs PATENT OFFICE HARRY T. SHEABERAND CHARLES A. BEIMSCHISSEL, F WAYNESBORO, PENNSYL- VANIA, ASSIGNORS TOLANDIS MACHINE COMPANY, 0F WAYNESBORO, PENNSYL- VANIL, .A CORPORATION OFPEN NSYLVANIA DIE HEAD Application led December 27, 1928. Serial No.328,635.

Our invention relates to die heads, and particularly to such die headsas are used on machines for cutting threads on bolts, screws, pipe,etc., using well-known tangential end y sharpened chasers. l y

An object of the invention is to prov1de a two unit die head in whichthe front unit carries the cutters for producing the screw threads, andthe rear unit constitutes the holding or driving unit; and to providemeans whereby the front unit may float relative to the rear or holdingand driving unit; and to provide further that the locking and drivingmembers shall be independent of each other.

A further object is to provide a die head 1n which a floating action issecured to the locking and closing 'members and in which the lockingmembers are contained in the floating unit and are not influenced by theholding or driving unit.

A further object of the invention is to provide a die head wherein thelocking means is permitted to iioat with the thread cutting carryingmeans, and wherein the thread cutting carrying means and locking meansare permitted to float relative to the die head holding shank.

Aqurther object of the invention is to provide. die head having a.loating front unit in which the locking mechanism is unaiected by thefloating of the front unit.

A further object of the invention is to provide a a die head composed oftwo units in which the front unit is driven by pins on the rear unit, sothat the driving or resultant forces are carried by the pins instead ofby the closing and locking means.

In constructions heretofore used, the locking pins bore the resultantforces of the cutters, such constructions being shown and described forexample inPatent #1,631,556, to Harry T. Shearer and in Patent#1,692,514 to Samuel F. Newman and James G. Harper.

In constructions heretofore shown as -in patent application #597 ,199 toHarry Shearer, the resultant forces of the cutters are carried by thetrunnions and the worm connected to the driving shank or body whereas inthis construction the resultant forces are carried by pins in theholding or driving unit which are independent of the trunnions, lockingpins or worms and at the same time this allows the opening action of thehead to be the pull-oil type or self-contained without relying onmechanical means such as spiders, yokes, cams, etc.

Further general objects are to provide a die head in which the cuttingand locking members float relative to the driving shank or X the drivingmember, and wherein misalignment of the Work will not aii'ect thelocking means. v

A further object is to provide a die head in which the resultant forcesof cutting (i threads do not act through the locking means to theholding shank or driving member.-

A still further object is to provide a die head employing tangentialchasers and trunnions mounted in a body carrying the same, inwhich theunit carrying the cutting members aligns itself with the stock beingcut, which stock can be eccentric with the shank or driving memberwithout causing a, rocking action upon the locking pins. 3.

Further objects and advantages will become apparent as the descriptionproceeds.

Referring to the accompanying drawings, which are m'ade a part hereofand on which similar reference characters indicate similar parts. s

Figure 1 is a lateral sectional view of the die head in locked closedposition taken on line 1-1 of Fig. 2, and line 1 1 of Fig. 9,

- Figure 2 is a section on line 2 2l of Fig. 1, l Figure 3 is a sectionon line 3-3 of Fig. 2, Figure 4 is a section on line 4-1-4 of Fig.

2, showing the parts in open position,

- Figure 5 is a section same as Fig. 4, showing the position of parts atthe moment of opening,

Figure 6 is a section on line 6--6 of Fig. 2,

Figure 7 is a section on line 7-7 of Fig. 2, showing position of partswhen the die head is clos' l Figaie 8 is a section same as Fig. 7,',showing position of parts when the die head is o en, s

pFigure 9 is a face view of the die head.

. In the drawings, numeral 10 indicates the f body member of the frontunit of the die head having an opening ring 11 surrounding the frontend, and an adjusting ring 12 surrounding the head body member just tothe rear of the opening ring, said opening and adjusting rings havingmounted therein opening means comprising a pin 13 on one ring and anabutment 14 on the other and a spring 15 acting against the pin on oneend and against the abutment at the other, and adjusting meanscomprising a worm 16 and a worm gear 17 shown in Figures 1 and 2, samebeing shown and described in Patents Nos. 1,631,556 and 1,692,514.Thebody member 10 has a flange 18 made integral therewith, for holdingthe opening ring from forward movement on the head body. A ring plate 19is secured to the rear face of the body member 10. Pins 20 are secured'in body member 10 (Fig. 8) and serve to take the resultant force ofthreading and will hereinafter be more fully described. Chaser holders21 carrying tangential chasers 22 are mounted upon trunnions positionedin bores in the front head body member 10 and pivotally connected bymeans of pins 23 and block 24 to the opening ring 11 so that relativerotation of the opening ring and the front head bodymember will open andclose the thread cutting jaws or chasers. The extended ends of trunnions25 pass through the rear ring plate 19 and are secured by means of nuts26 and lock screws 27 having a conical end which seats in acorresponding conical cavity in an end of the trunnion. A closing andlocking ring 28 has mounted therein conical end pins 29 which extendthrough bores in the adjusting ring 12 into bushings 30 in the ring 11.`Ring 28 is connected to the adjusting ring 12 by means of screws 31which pass through bores in the ring 28 and screw into ring 12. Thesescrews serve to limit movement of rings 28 in open position of the head.The front unit comprising all the above numbered and described parts,because of clearances 32, 33, 34, 35 and 35 is free to float in relationto the holding or driving member 36 and its component parts. It will benoted' from an inspection of Figures 7 and 8 that clearances 35 and 35are tapered. The holding or driving member 36 has a projecting flange 37in which are mounted rods 38 with heads 39, said rods being held inplace by removable pins 40. Surrounding rod 38 is a spring 41 lyingbetween the head ofthe rod and ring plate 19, said springs being undercompression at all times and tending to hold the holding and drivingunit and the front unit together. Projecting from flange 37 is a flange42 which in connection with flange 37 forms a surface against which thefront unit rests. This surface is finished as at 43 at an angle to theaXis of the member 36 to aid in the floating action of the front unit,flange 42 also forming a stop for ring 28 when the remainder of thefront unit moves forward in opening action. Member 36 has bores 44 toreceiving pins 2O said bores being of such size as to make clearances 35about the ends of pins 20, said bores '1 head is advanced upon the workthrough the medium of member 36. The die head having cut the properlength of thread, member 36 is stopped in its axial travel by means (notshown) the chasers being engaged in cutting screw threads draw the frontunit comprising body member 10, rings 11, 12, 19, 28 and all theirintegral parts forward causing a separation as at 45, Fig. 5, thisseparation being made against compression springs 41. The ring 28 beingstopped in this travel by flange 42 withdraws pins 29 from the bushings30 allowing the ring 11 to rotate which rotation causes ring 28 and pin29 to assume positions as shown by Fig. 4. A return of the parts tolocked thread cutting position is obtained by pushing ring 28 forward asshown in Fig. 1, springs 41 being of sufficient strength to overcome theload picked up by conical pins 29 in the rotating of ring 11 againstsprings 15.

It will be noted that as the opening action takes place springs 41acting between the holding and driving member and the body member bringthe body member to the same position as taken by this member when thedie head is closed and that ring 28 takes a p0- sition independent ofthe remainder of the front unit as shown in Fig.y 8, also that aclearance is provided at 46 to permit ring 28 to move a part of themovement which the front unit takes relative to the rear unit.

It will be obviousI to those skilled in the art that various changes maybe made in our device without departing from the spirit of theinvention, and we, therefore, do not limit ourselves to what is shown inthe drawings and described'in the specification, but on y as set forthin the appended claims.

Having thus fully described our said invention, what we claim as new anddesire to secure by Letters Patent, is

1. A die head comprising a front body member and a rear body member, anopening ring, an adjusting ring mounted on the front body member and aclosing and locking ring secured to said adjusting ring, conical pinsmounted in said closing and locking ring, means permitting the frontbody member and said rings to move axially relative to the rear bodymember and means to limit the movement 'of said closing and locking ringrelative to the rear body member and said adtenaces justing ring wherebysaid conical pins lock and unlock the die head, substantially as setforth.

' 2. A thread cutting die head comprising a front unit having a bodyportion with an opening and an adjusting ring mounted thereon, a rearunit having a body portion with a 'closing and locking ring mountedthereon, conical pointed pins carried by the closing and locking ring,said pins engaging bores in the openlng ring to hold the said ring inlocked position, pins carried by the rear body member extending intobores in the front body member for driving the latter bythe former, andresilienti means for holding the front and rear body members togetherbut yieldable to permit a slight axial movement therebetween, suchmovement permitting withdrawal of the points of the conical pins fromthe bushings in the opening ring to permit the ring to open,substantially as set forth.

3. A thread cutting die head comprising a front body member havingopening and adjusting rings mounted thereon, a flange on the frontportion of the body member, a plate secured to the rear of the bodymember for securing the rings upon thebody member, a shank. or holdingmember having a closing and locking ring mounted thereon, a flange onthe front portion of the shank to limit the forward movement ofthe saidclosing and locking ring, a plurality of pins secured I in the saidshank and extending into bores in the front body member, springssurrounding said pins engaging heads on the pins at one end and the saidplate on the rear of the front body member at the other end, saidsprings tendingy to hold the front body member and the said shanktogether, said closing and locking ring carrylng conical ointed pins,the ends of which engage in ores in the opening ring to lock the openingring in thread cutting position, substantially as set forth.

4. A thread-cutting die head comprising a front unit and a rear unit,the front unit carrying an opening ring, an adjusting ring and chaserholders carrying thread-cutting chasers, the rear unit carrying aclosing and locking ring, conical pins mounted in said nected to one ofsaid plurality of rings, the' ring on the driving member carrying meansengageable -With that one of said plurality of rings which is operablyconnected to the chaser holders to actuate said chaser holders, drivingpins carried by one of said body members and engaging sockets in theother body member, tapered clearances being provided about the ends ofthe pins in said sockets to permit said front body member to pivot onthe driving member, said pins and bores transmitting the cutting thrustfrom the front body member to the driving member, substantially as setforth.

In witness whereof, We have hereunto set v our hands at Waynesboro,Pennsylvania, this eleventh day of December, A. D. nineteen hundred andtwenty-eight. HARRY T. SHEARER. CHARLES A. REIMSCHISSEL.

closing and locking ring for locking said head, clearances beingprovided between said closing and locking ring and the rear unit,driving pins in one unit, engaging sockets in the other unit to drivethe front unit from the rear unit, said sockets having taperedclearances about said pins the first named and last named taperedclearances providing means whereby the front unit may have a vpivotalmovement in all directions relative to the rear l ical pins in saidopening ring, and means for vno

